28249201 has 4 divisors (see below), whose sum is σ = 28260004. Its totient is φ = 28238400.

The previous prime is 28249187. The next prime is 28249229. The reversal of 28249201 is 10294282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8880400 + 19368801 = 2980^2 + 4401^2 .

It is a cyclic number.

It is not a de Polignac number, because 28249201 - 2⁷ = 28249073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28249201.

It is not an unprimeable number, because it can be changed into a prime (28249261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1261 + ... + 7621.

It is an arithmetic number, because the mean of its divisors is an integer number (7065001).

Almost surely, 2^28249201 is an apocalyptic number.

It is an amenable number.

28249201 is a deficient number, since it is larger than the sum of its proper divisors (10803).

28249201 is an equidigital number, since it uses as much as digits as its factorization.

28249201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28249201 is about 5314.9977422385. The cubic root of 28249201 is about 304.5570961102.

The spelling of 28249201 in words is "twenty-eight million, two hundred forty-nine thousand, two hundred one".